E: info@deltapanels.com      Head Office: 731 Boundary Road, Richlands, Qld 4077    +61 7 3271 2170
 W: www.deltapanels.com     Sydney Depot:  11 The Old Northern Road, Narellan, NSW 2567   +61 2 4611 7712
ABN: 11 147 861 292
Version Date: 
2025-11-25
15
STEP 1         DETERMINING CORRECT WIND SPEED
Step 1.5       Wind Classification Chart
WIND CLASSIFICATION CONVERSION TABLE
WIND CLASSIFICATION
Serviceability 
Limit State 
Gust Wind Speed
metres per second
Ultimate Limit State
Gust Wind Speed
metres per second
Regions A and B
Regions C and D
N1 (Non-Cyclonic)
N/A
W26
W34
N2 (Non-Cyclonic)
N/A
W26
W40
N3 (Non-Cyclonic)
C1 (Cyclonic)
W32
W50
N4 (Non-Cyclonic)
C2 (Cyclonic)
W39
W61
N5 (Non-Cyclonic)
C3 (Cyclonic)
W47
W74
N6 (Non-Cyclonic)
C4 (Cyclonic)
W55
W86
Please Note: 
This is to be used as a guide only. Check with your local authority for your exact rating. For a complete 
analysis of estimating please refer to Australian Standard AS/NZS 1170.2:2021 and AS 4055:2021
Delta Panels will not accept any liability for any loss or damage suffered as a result of any errors 
in the misinterpretation of any information provided in this guide. It is recommended to seek the 
services of an independent registered Engineer to confirm any calculations.

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